You're agreement seems to be, that even if it's not perfect, it's that best we got.
But consider this: there are several postings on here that are from law enforcement officers (FBI, in one case) that discuss how investigations were launched against them, where nothing was found. Your tax dollars at work, and money in a poly operator's pocket no matter what the outcome.
One email on this site discussed how an agent failed a poly question re: espionage and he was removed from his work environment for a yr, while over $1MM was spent on an investigation on him, and nothing was found. First and only time that's happened? Doubt it.
The poly's never has caught a person who has committed espionage. That would even suggest that the poly would remove suspension from those who are engaged in the activity. --Maybe the poly's a tool for that activity???? Scary thought.
Other times, people who are under suspicion pass, and walk, based on that one event. Ted Bundy killed more co-eds after a poly gave him his 'get outta jail free' pass. Operator gets paid though, no matter if the device doesn't work.
I don't believe the poly can help in investigations; can't be used in court... all the work done on convicting an offender is based on hard evidence, not on if your pulse races when someone strap’s you to a machine that indicates your pulse races when asked, "did you touch that child's privates?".
A lady that was raped came to this website for help when the rapist passed the poly, and she was asked to take one. Her fear (rightly so) was that the event was so tramitic, she was afriad of getting a false positive.
So, a poly CAN BE a huge hindrance to getting to the truth.
If we removed the poly as an instrument for determining suspession (because, that's all it can really be used for), what would we miss out on?
I do know that if that happened, operators would have a hard time finding use of their GEDs and poly experience in other vocations.... 8)